What are three chemical changes and what are three physical changes?

Steel is formed when a little bit of carbon is added to this element

Which statement about the law of conser- vation of mass is NOT true? A) The mass of reactants must equal the mass of products. B) All the atoms on the reactant side of an equation are also on the product side.

Which statement best summarize the relationship between the muscular system and the cardiovascular system? A. The heart is protected from injury by the breastbone. B. Nutrients are carried to the heart through arteries and veins C.

Energy of motion or change in position

What are estuaries often called?

This element has 3 electrons in its Lewis dot structure and is in the 3p orbital section.

In an exothermic reaction, energy is transferred from a. the reactants to the surroundings. c. one reactant to another. b. the surroundings to the reactants. d. the container to the chemicals.

In any chemical compound the elements are always combined in the same proportion by__. a) charge b) mass c) volume d) density

Which would exhibit characteristics of both a metal and a nonmetal? select one: a. si b. ge c. sb d. po e. all of the above exhibit characteristics of both a metal and a nonmetal?

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.